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Radionuclide Dosimetric Data Sheets
Astatine-208
Summary data
General
Classification
Isotope: At-208
Atomic number (Z): 85
Mass number (A): 208
Neutron number (N): 123
Radioactive decay
Decay modes: α, β+, Electron capture
Half-life: 1.63 [h]
Decay constant: 1.1812e-04 [1/s]
Daughters: Po-208 (99.5%), Bi-204 (0.55%)
Radioactive daughters: Po-208, Bi-204
Dosimetric constants
Mean alpha energy: 0.0316 [MeV]
Mean electron energy: 0.15975 [MeV]
Mean photon energy: 3.04078 [MeV]
Air kerma rate constant, Γ10: 1.250e-16 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.263e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.066e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 5.063e-15
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.559e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.872e-13
[Gy·kg/Bq·s]
Summary spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/At-208 Summary Spectrum.csv
Beta spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated beta spectra file here: www.mirdsoft.org/products/MIRDspecs/At-208 Beta Spectrum.csv
Tabulated data
Summary spectra (table)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Note: Radiations with yield < 0.01 are excluded from the table, but are available in the linked *.csv data.
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/At-208 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.84122e-05 |
2.086e+01 |
X-ray |
|
2.54802e-03 |
8.587e-02 |
X-ray |
|
9.68940e-03 |
1.279e-02 |
X-ray |
|
1.10135e-02 |
2.235e-02 |
X-ray |
|
1.11319e-02 |
1.967e-01 |
X-ray |
|
1.33474e-02 |
3.857e-02 |
X-ray |
|
1.34935e-02 |
1.454e-01 |
X-ray |
|
1.58015e-02 |
3.035e-02 |
X-ray |
|
7.71271e-02 |
2.756e-01 |
X-ray |
|
7.96070e-02 |
4.588e-01 |
X-ray |
|
8.95836e-02 |
5.150e-02 |
X-ray |
|
9.01425e-02 |
9.994e-02 |
X-ray |
|
9.25794e-02 |
1.242e-02 |
X-ray |
|
9.27189e-02 |
2.451e-02 |
X-ray |
|
1.77595e-01 |
4.859e-01 |
Gamma |
|
2.05400e-01 |
6.341e-02 |
Gamma |
|
2.94070e-01 |
1.063e-02 |
Gamma |
|
3.33670e-01 |
2.098e-02 |
Gamma |
|
3.95740e-01 |
1.229e-02 |
Gamma |
|
5.11000e-01 |
6.340e-02 |
Annihilation photon |
|
5.17055e-01 |
6.049e-02 |
Gamma |
|
6.31830e-01 |
3.219e-02 |
Gamma |
|
6.60040e-01 |
8.878e-01 |
Gamma |
|
6.86527e-01 |
9.756e-01 |
Gamma |
|
6.94330e-01 |
3.746e-02 |
Gamma |
|
6.97940e-01 |
1.376e-02 |
Gamma |
|
7.33680e-01 |
1.395e-02 |
Gamma |
|
7.55890e-01 |
1.502e-02 |
Gamma |
|
7.69340e-01 |
2.078e-02 |
Gamma |
|
8.07137e-01 |
5.854e-02 |
Gamma |
|
8.11180e-01 |
1.210e-02 |
Gamma |
|
8.45044e-01 |
1.971e-01 |
Gamma |
|
8.86320e-01 |
2.439e-02 |
Gamma |
|
8.96660e-01 |
5.366e-02 |
Gamma |
|
9.47100e-01 |
1.717e-02 |
Gamma |
|
9.83120e-01 |
4.566e-02 |
Gamma |
|
9.89940e-01 |
1.073e-01 |
Gamma |
|
1.00860e+00 |
2.244e-02 |
Gamma |
|
1.02766e+00 |
1.678e-01 |
Gamma |
|
1.18000e+00 |
1.073e-02 |
Gamma |
|
1.19531e+00 |
1.473e-02 |
Gamma |
|
1.22918e+00 |
3.122e-02 |
Gamma |
|
1.34344e+00 |
2.078e-02 |
Gamma |
|
1.43880e+00 |
1.161e-02 |
Gamma |
|
1.53771e+00 |
1.727e-02 |
Gamma |
|
2.02933e+00 |
1.551e-02 |
Gamma |
|
2.63860e+00 |
2.078e-02 |
Gamma |
|
1.09773e+00 |
1.562e-02 |
Positron |
|
3.94884e-05 |
5.010e+00 |
Auger electron |
|
9.75388e-05 |
6.476e+00 |
Auger electron |
|
1.22138e-04 |
1.268e-02 |
Auger electron |
|
1.75215e-04 |
3.523e+00 |
Auger electron |
|
4.40424e-04 |
8.929e-01 |
Auger electron |
|
7.38500e-04 |
2.523e-01 |
Conversion electron |
|
1.10860e-03 |
2.307e-01 |
Auger electron |
|
2.02487e-03 |
1.847e+00 |
Auger electron |
|
2.32584e-03 |
2.568e-01 |
Auger electron |
|
2.76167e-03 |
1.350e-02 |
Auger electron |
|
4.02000e-03 |
7.940e-02 |
Conversion electron |
|
8.50433e-03 |
4.688e-01 |
Auger electron |
|
1.10584e-02 |
2.143e-01 |
Auger electron |
|
1.36424e-02 |
2.335e-02 |
Auger electron |
|
6.18768e-02 |
2.236e-02 |
Auger electron |
|
7.46184e-02 |
1.235e-02 |
Auger electron |
|
8.41710e-02 |
1.044e-01 |
Conversion electron |
|
1.11976e-01 |
7.788e-02 |
Conversion electron |
|
1.60677e-01 |
1.626e-02 |
Conversion electron |
|
1.61298e-01 |
1.059e-01 |
Conversion electron |
|
1.63778e-01 |
6.467e-02 |
Conversion electron |
|
1.74314e-01 |
4.964e-02 |
Conversion electron |
|
1.77595e-01 |
1.589e-02 |
Conversion electron |
|
1.88482e-01 |
1.227e-02 |
Conversion electron |
|
5.66616e-01 |
1.138e-02 |
Conversion electron |
|
5.93103e-01 |
1.159e-02 |
Conversion electron |
Useful Links
Isotope decay characteristics are periodically updated as better measurements can be made - changes that may not be reflected on this page. Please see useful links:
National Nuclear Data Center (NNDC): https://www.nndc.bnl.gov/nudat3/mird/
International Atomic Energy Agency (IAEA) Livechart: https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html
Reference Links
ICRP Report 107: https://www.icrp.org/publication.asp?id=ICRP%20Publication%20107
Graves et al. Dose Point Kernels: https://doi.org/10.1002/mp.13789
MIRD Decay Schemes 2nd Edition: https://sites.snmmi.org/SNMMI-MAIN/iCore/Store/StoreLayouts/Item_Detail.aspx?iProductCode=0-932004-80-6
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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